Patent GB-629531-A (GB)
Title: Improvements in taper grinding machines
IPC: B24B5/14
Filed: 1946-02-08
Abstract: 629,531. Grinding machines. BRYANT CHUCKING GRINDER CO. Feb. 8, 1946, No, 4063. Convention date, Jan. 23, 1945. [Class 60] A taper grinding machine comprises a pair of members one movable relative to the other in traverse direction and in a direction transverse to said traverse direction, a grinding wheel spindle carried by one of said members and extending parallel to said traverse direction and supporting one or more grinding wheels formed with an active taper portion, a work holder carried by the other member, power means for relatively traversing said members, cam means for causing the traverse to effect such relative transverse motion to produce motion of said wheel spindle in accordance with the taper of said wheel or wheels, a direction reversing mechanism having an element carried by one of said members and spaced dogs carried by the other of said members in position to actuate said element at the traverse limits and thereby reverse the traverse direction, and means actuable to relatively move said element and dogs and a portion of said cam means into positions in which the taper portion of said wheel or wheels may operate upon work held by said work holder. An arm 4, Figs. 1, 8, carrying a spindle 3 to which is removably secured a rough grinding wheel 41 and a fine grinding wheel 40, both with tapered faces, is suspended on a fulcrum bar 5 which is traversed, axially with respect to a rotated hollow work-piece 1, by mechanism controlled by hydraulically operated pilot valve means 12. The arm 4 is rocked about its pivot during the traverse to give the grinding wheels a simultaneous transverse motion for internal taper grinding of the workpiece under control of a cam 95, Figs. 2, 6, attached to an extention 10 at the lower end of the arm 4 and engaging one of two rollers 97, 98 mounted on a normally stationary carriage 57, one roller being used in the grinding operation and the other when truing the grinding wheels. The bracket 10 also has secured thereto two pairs of reversing limit dogs 53, 54 and 51, 52, one pair being associated with the use of the grinding wheels and the other pair with the use of truing mechanism. These dogs engage a reversing lever 55, pivotally carried by the carriage 57, which serves through valve means 203, 204 and the pilot valve means 12, 19 linked hydraulically therewith to initiate a reversal of the traverse mechanism. When the rough grinding wheel 41 is used the table 57 is moved to the right Fig. 2, and held against an adjustable stop by piston and cylinder means 118a, the lever 55 engaging the stops 53, 54 and the roller 97 co-operating with the cam 95. When the fine grinding wheel 40 is used, the grinding wheel 41 having been removed, the table is moved to the left, Fig. 2, by piston and cylinder means 118 and held against an adjustable stop, the lever 55 engaging the stops 53, 54 and the roller 97 the cam 95 as before. To give a rough adjustment of the feed of the grinding wheel, the carriage 57, and thus the arm 4 and the grinding wheel is moved transversely by a bar 72 operated by a disc 81, Fig. 6. For a fine, axial feed the adjustable stops are moved by handles 156a or 156. For truing either grinding wheel the carriage 57 is in the same position for the wheel as for grinding but the lever 55 now engages the stops 51, 52 and the cam 95 the roller 98.